I think he might be out of luck. A quick read of the link below certainly sets the precedent.
Manitoba GDL regulations:
LINK
One enters the GDL programme at 16 years of age, and it lasts 60 months. However, the 60 month period is not reduced by starting older. Interesting to note is the requirement for 0% BAC for 36 months during the first full licence period. The upshot being one could be 25 years old and still have to drive alcohol free (given that you got your learner`s as late as 21 years of age).